Geochemical and isotopic constraints on the diagenetic history of a massive stratal, late Cambrian (Royer) dolomite, Lower Arbuckle Group, Slick Hills, SW Oklahoma, USA

Details Geochemical and isotopic constraints on the diagenetic history of a massive stratal, late Cambrian (Royer) dolomite, Lower Arbuckle Group, Slick Hills, SW Oklahoma, USA Geochemical and isotopic constraints on the diagenetic history of a massive stratal, late Cambrian (Royer) dolomite, Lower Arbuckle Group, Slick Hills, SW Oklahoma, USA

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1979g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 54, Issue 7, pp.1979-1989

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5

Scientific paper

The diagenetic history of the late Cambrian massive Royer dolomite from the lower Arbuckle Group, Slick Hills, SW Oklahoma, USA, has been evaluated through comprehensive geochemical analyses. The dolomite probably formed during early diagenesis from contemporaneous late Cambrian seawater, evidenced by similar 87 Sr / 86 Sr ratios (from 0.70891 to 0.70913) of most (70%) dolomite samples, to coeval late Cambrian seawater (from 0.7089 to 0.7092). Very light 18 O values (-10.2 to -12.9 , PDB), however, indicate that the dolomite was significantly modified during burial. Correlation of various geochemical parameters (Sr, Fe, 18 O , and 87 Sr / 86 Sr ) demonstrates that dolomite samples with increased modification are characterized by lower Sr and higher Fe concentrations, lighter 18 O values, and less radiogenic 87 Sr / 86 Sr ratios. This correlation, coupled with the light 18 O values of the dolomite, demonstrates that meteoric water, recharged into overlying carbonates, was responsible for burial modification of the dolomite. Geochemical comparison of the dolomite with associated limestone and quantitative modelling of 18 O , Sr, and 87 Sr / 86 Sr variation during water-rock interaction suggest that the dolomite underwent long-lasting modification. The timing of meteoric modification was coincident with the development of regional overlying unconformities corresponding to emergence of the carbonate platform. Similar diagenetic modification has probably been responsible for 18 O depletion and trace element modification of ancient dolomites in many other areas, although many of these dolomites have been interpreted to have formed either in mixing-zone environments or in subsurface environments.

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